Submit a ticketCall us

WebinarUpcoming Webinar: Know What’s Changed – with NEW Server Configuration Monitor

Change management in IT is critical. But, even with a good change management process, changes are too often not correctly tracked, if at all. The configuration of your servers and applications is a key factor in their performance, availability, and security. Many incidents can be tracked back to an authorized (and sometimes unauthorized) configuration change, whether to a system file, configuration file, or Windows® Registry entry. Join SolarWinds VP of product management Brandon Shopp to discover how the new SolarWinds® Server Configuration Monitor is designed to help you.

Register now.

Home > Success Center > Network Performance Monitor (NPM) > HTTP Error 503: The Server is unavailable

HTTP Error 503: The Server is unavailable

Updated March 11th, 2016


The following errors appear on the Orion Web Console:

Website configuration failed

Unable to restart Orion Application Pool. Please use IIS Manager to restart it manually

Web request for /Orion/Login.aspx failed - The remote server returned an error: (503) Server Unavailable


All Orion Core products


The error is caused when the configuration wizard is not able to start the application pool in IIS or after the server reboot. A sample error is shown below after running the configuration Wizard.


  1. Start the Application Pool in IIS.
  2. Launch IIS manager. Click Start > Run > inetmgr.
  3. Expand the server.
  4. Select Application Pools.
  5. Right-click SolarWinds Orion Application Pool > Start.


If this doesn't resolve issue continue on with clearing the .net cache: Refer to:

Last modified